How uniapp deals with the problem of font sizes on different terminals

With the diversification of mobile devices, developers need to consider devices of different sizes, including different resolutions, screen sizes, operating systems and other issues. One of the key issues is font size at different ends. Because font size has a great impact on user experience and interface design, how to deal with the issue of font sizes at different ends in uniapp development is very important.

1. Why do we need to deal with the problem of font sizes on different terminals?

When using uniapp to develop mobile applications, developers need to control the font size to adapt to different terminal devices. First, font size directly affects user experience. If the font is too small, it will be difficult for users to read and it will cause inconvenience to users; if the font is too large, the interface will appear uncoordinated and affect the interface structure. Secondly, the screen sizes of different devices are different. If you want the same content to present the same effect on devices of different sizes, you need to adapt it according to the screen size.

2. How to set the font size at different ends?

For uniapp developers, you can use the following method to set the font size at different ends.

1. Adaptation scheme based on rem and px

By using the adaptation scheme of rem and px, the font size can be adaptive. rem is the font size unit relative to the root element (html), while px is the absolute unit. You can use the postcss-pxtorem plug-in to automatically convert the px unit in css to rem unit, and then set the base font size in the html style sheet. In this way, the font size can be adapted on different terminals.

2. Use vw and vh units

Compared with the rem and px adaptation solutions, using vw and vh units requires more detailed calculations. vw represents the percentage of the window width, vh represents the percentage of the window height. By setting different vw and vh values, the font size can be adapted to devices of different sizes.

You can use the following code to set the vw and vh units in uniapp:

font-size: 2vw;  /*设定字体大小*/

3. Set the font size based on the device pixel ratio

The device pixel ratio refers to the pixels on the screen The ratio of points to actual length. Specifically, for the common 1x device pixel ratio, 1 device pixel corresponds to 1 actual pixel; for 2x device pixel ratio, 1 device pixel corresponds to 4 actual pixels; for 3x device pixel ratio, 1 Device pixels correspond to 9 actual pixels.

For different device pixel ratios, different font sizes need to be set. You can use the following code to set the device pixel ratio in uniapp:

@media (-webkit-min-device-pixel-ratio: 1.5),(min-device-pixel-ratio: 1.5) {
  font-size:16px;// 当设备像素比是1.5倍时，字体大小设置为16px
}

3. Summary

For uniapp developers, it is very important to control the font size for display on different terminals. Work. Font sizes at different ends can be adapted through rem- and px-based adaptation schemes, using vw and vh units, and setting font sizes based on device pixel ratio. In the actual development process, it is necessary to choose the appropriate method to adapt the font size according to different scenarios and needs, improve the user experience, and achieve the best effect of interface design.

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